https://scholars.lib.ntu.edu.tw/handle/123456789/74234
標題: | Effects of mixing sequence on alumina prepared by injection molding | 作者: | Wei, Wen-Cheng J. Tsai, Sha-Jong Hsu, Kung-Chung |
公開日期: | 1998 | 卷: | 18 | 期: | 10 | 起(迄)頁: | 1445-1451 | 來源出版物: | Journal of the European Ceramic Society | 摘要: | Two mixing sequences of binder system were used to prepare the feestocks containing high purity alumina (A-16SG) powder. The properties of the feedstocks were analyzed by various techniques, including FT/IR, capillary rheometry, and TGA. Besides, the green density and pore size distribution of injection molded Al2O3 parts, and the sintered densities, the fracture strength and Weibull distribution of the densified test bars were measured. The results indicated that the sequence of binder addition is better adding polypropylene (PP) into preheated alumina powder, then stearic acid (SA), followed by a paraffin wax (PW). This mixing step was found effective for the preparation of a good mixture of plastics/powder system to prdouce feedstocks with a lower viscosity and better homogeneity for injection molding. The statistics of fracture strength and the results of fractography reveal that the sintered test bars made by the better feestocks have a uniform microstructure which is free from large cracks and pore clusters. They result in a higher fracture strength (375 MPa) and Weibull modulus (up to 20.9) than those produced by the other process. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/95349 https://www.scopus.com/inward/record.uri?eid=2-s2.0-0032415505&doi=10.1016%2fS0955-2219%2898%2900021-1&partnerID=40&md5=eed45cd736acc95513c2f28f03536e6e |
ISSN: | 09552219 | SDG/關鍵字: | aluminum oxide; mixing; moulding machine |
顯示於: | 材料科學與工程學系 |
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